Susan is traveling, so I will answer this question. If your question refers to our Precious Metal Gems, they vary by size. The 4.5" model takes 1 AA, the 6" takes 2 AA, and the largest at 6.75" uses 2 C batteries. Hope this helps? The battery requirements on all California Exotic Novelties products are available on an Excel spreadsheet at link under the downloads tab. battery info, and anything else you would care to know about our products is on the spreadsheet.